Fuse plug



PLUG

Filed Nov. 28. 3.930

.INVENTOR- -@a v5. @Weiz ATTORN Patented Nov. 1, 1932 UNTED STATES LEO S. ONEIL, OF DETROIT, MICHIGAN FUSE PLUG Application filed November 28, 1930.

My invention relates to a new and useful improvement in a fuse plug and has for its object the provision of a fuse plug which is provided with a plurality of fusible members which may successively brought into operative position and used so that a multiple of fuses is provided in a single fuse plug.

It is another object of the present invene tion to provide a fuse plug of this class having a plurality of fusible members supported on a transparent retainer so that a person may ascertain at a glance which of the fusible elements have been used7 thus facilitating and rendering more rapid the adjustment of the fuse plug to its various positions of use.

Another obiect of the invention is the provision of a device of this class which will be simple in structure, economical of manufacture.. and hihly eihcient in use.

Other objects will appear hereinafter.

The invention consists in the combination and arrangement of parts hereinafter described and claimed.

The invention will be best understood by a rfefermce to the accompanying drawing which forms a p rt of this specification, and in which,

Fig. 1 is a side elevational view of the invention.

Fig. 2 is a central vertical sectional view of the invention with a section enlarged.

Fig. 3 is a sectional view taken on line 3-3 of Fig. 2.

Fig. 4 is a sectional view taken on line 4--4 of Fig. 2.

The invention comprises a screw plug 7 having the cup-shaped portion 8 at one end to provide a cavity or recess 9. Embracing the plug 7 is the threaded metallic shell 10 having a plurality of arms 11 projecting into the cavity or recess 9 and extending through and doubled over as at 12 on the arcuate metallic member 13 which is positioned in the cavity 9 and provided with the upwardly turned end 14, the member 13 being formed from resilient material. The upwardly turned end 14 is adapted to engage the contact heads 15 carried by the rivets or pins 16 which are secured to the enlarged metallic ends 17 of the narrow fusible strips 18 which Serial N0. 498,618.

project radially inwardly to the central metallic disc or hub 19. As shown in Fig. 3, there are a number of these strips 18 each terminating in an enlarged end 17 secured by a pin 16 to the ring 20 which is formed of insulating material as is likewise the plug 7. fr screw 21 is projected through the hub or disc 19 and also through the baseof the cup shaped member 23 which is formed from transparent material. The screws 22 serve to bind the ring 20 on this cup shaped member, the outer surface of the base 25 thereof having a recess 24 to provide a central boss through which the screw 21 is projected. This cup shaped member is secured on the member 8 by means of the metallic threaded sleeve 26 threaded on the peripheral threads 27 and having one end bent inwardly as at 28 over the peripheral flange 29 which is carried by the member 23.

Extending axially through the plug 7 is a metallic rod 30 having at its outer end a contact head 31 and extending at its inner end through the metallic plate 32 having the inwardly turned end 33 provided with the contact boss 33 which engages the disc or hub 19.

In use, the member 23 may be rotated relatively to the member 8 so that the contact heads 15 may successively be brought into engagement with the resilient contact member 14 thus permitting the successive use of the various fuse strips. By forming the member 28 from transparent material, the operation of the device may be observed at all times, and a ready and quick movement of the member 23 to the proper positions may be easily and quickly determined and observed.

lVhile I have illustrated and described the preferred forms of construction of my in venlion, I do not wish to limit myself to the preoise details of structure shown, but desire to avail myself of such variations'and modifications as may come within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a device of the class described, a fuse plug formed cup shaped at one end; a metallic disc; a plurality of fusible strips radiating outwardly from said disc; an annular member; contact pins connected to the outer end of each of said strips and projected through said annular member; a transparent cover, said cover and said annular member being projectable into the cup shaped portion of said pluO'.

2. In a device of the class described, a fuse plug formed cup shaped at one end; a metallic disc; a plurality of fusible strips radiating outwardly from said disc; an annuk lar member; contact pins connected to the outer end of each of said strips and projected through 'said annular member; a transparent cover, vsaid cover `and said annular member being proj ectable into the cup shaped portion of said plug; and means for binding said cover and said annular member together.

3, In a device of the class described, a fuse plug formed cup shaped at one end; a metallic disc; a plurality of fusible strips radiating outwardly from said disc; an annular member; Contact pins connected to the outer end of each of said strips and projected through said annular member; a transparent cover, said cover and said annular member being proj ectable into the cup shaped portion of said plug; means for binding said cover and said annular member together; and means for connecting said cover and said cup shaped portion rotatably together.

4. In a device of the class described, a fuse plug having a cup shaped portion; a transparent member for'said cup shaped portion and proj ectable thereinto; a peripheral {iange for limiting the projection of said cover into said cup shaped portion, the outer surface of said cover being recessed to provide a central boss; a metallic disc mounted on the outer surface of said boss; a plurality of fusible strips radiating outwardly from said disc and terminating flush with the periphery of said cover; an annular member; a contact pin secured to each of said strips and projected through said annular member; and means for securing said annular member for clamping the outer ends of said fusible strips against the base of said cover.

5. A fuse plug of the class described, comprising: ascrew plug having one end formed cup-shaped; a metallic contactrmember seated in the base of said cup-shaped portion Vand having an outwardly turned resilient portion; a metallic disc; a plurality of fusible strips radiating outwardly from said disc; a carrying member supporting said member rotatably on said cup-shaped portion; a plurality of contacts each connecting to one of said strips adjacent its outer end, said contacts being successively engageable upon rotation of said carrying member relatively to said screw plug with said outwardly turned portion of said contact member.

6. A fuse plug of the class described, comprising: a screw plug having one end formed cup-shaped; a metallic contact member seated in the base of said cup-shaped portion and having an outwardly turned resilient portion; a metallic disc; a plurality of fusible 

